C is a mixture of two simple inorganic salts, one of which is a sodium salt.
Perform the following exercises on C. Record your observation and identify any gas(es) evolved. State the conclusions you draw from the results of each test.
(a) Put all of C into a test tube and add about 10 cm\(^3\) of distilled water and shake.
b(i) Put about 2 cm\(^3\) of the filtrate into a boiling tube and heat strongly.
(ii) Put half of the residue into a test tube and add dil. HCl.
(iii) To about 2 cm\(^3\) of the clear solution from b(ii), add aqueous NaOH in drops, then in excess.
(iv) To another 2 cm\(^3\) of the clear solution from b(ii), add aqueous ammonia in drops, then in excess.
D contains 6.30 g of HNO\(_3\) in 500 cm\(_3\) of solution. E was prepared by dissolving 8.20 g of washing soda crystals ( Na\(_2\)CO\(_3\).xH\(_2\)O) in 250 cm\(^3\) of distilled water.
(a) Put D into the burette and titrate it against 20.0 or 25.0 cm\(^3\) portion of E using methyl orange as indicator.
Repeat the exercise to obtain concordance titre values.
Tabulate your results and calculate the average volume of the acid used.
(b) Write a balanced chemical equation for the reaction.
(c) From your results and the information given;
(i) calculate the concentration of E in moldm\(^{-3}\);
(ii) what is the value of x in Na\(_2\)CO\(_3\).xH\(_2\)O? [H= 1.0; C =12.0; O = 16.0; Na = 23.0; N = 14.0 ]
F is an inorganic salt. Carry out the following exercises on F. Record your observations and identify any gas(es) evolved. State the conclusions you draw from the results of each test.
(a) Transfer F into a test tube and add dil. HCl to it until a clear solution is obtained.
(b) Divide the clear solution obtained from (a) into two portions
(i) To the first portion add NaOH\(_{(aq)}\) in drops and then in excess.
(ii) To the second portion, add few drops of potassium hexacyanoferrate (II) solution.
(a) An aqueous solution of a salt was added to excess sodium sodium trioxocarbonate (IV) solution in a test tube. There was effervescence, the test tube became warm and a white precipitate was observed. State three inferences that could be drawn from these observations.
(b) Consider the following salts; NH\(_4\)Cl; PbSO\(_4\); NaHCO\(_3\) and Cu(NO\(_3\))\(_2\).
Select from the list, the salt(s) which:
(i) would not readily dissolve in water;
(ii)produce(s) effervescence with dilute mineral acids;
(iii) decompose(s) on heating;
(iv) dissolve(s) in water to form an alkaline solution;
(v) sublime(s) on heating
(c) A solution of an acid was titrated with sodium hydroxide solution using methylorange as the indicator. State three precautions that are necessary when carrying out such an experiment.
